Grounded resistance unit



Aug. 14, 1934. McWE EI NY 1,970,051

GHOUNDED RESISTANCE UNIT Filed April 30, 1931 J5 I Z6 J6 20 KY 20 J5 13O 76 7 o F] J9 177 J6 0 J4 I Patented Aug. 14, 1934 1,970,051

UNITED STATES PATENT I OFFICE 1 GROUNDED RESISTANCE UNIT John L.McWeeny, Chicago, 111., assignor, by mesne assignments, to The MuterCompany, Chicago, 111., a corporation of Illinois Application April 30,1931, Serial No. 533,933 I 2 Claims. (01. 201-63) 'My invention relatesto resistance devices and Fig. 6 is an electrical diagram of theresistor more particularly to a novel construction of fixed hereinillustrated, and IBSiStOrWhOSe P a y p p s is to provide in Fig. 7 is anenlarged perspective view of the one unit, both positive and negativepotential terminal clip utilized herein. relative to the potential ofground. By reference to the drawing it will be seen that 80 In themanufacture of fixed resistors adapted the device of my inventioncomprises a single for use in the common radio and similar appamstrip ofnon-conducting material 10 adapted for it iS frequently ecessary anddesirable to use as a base, two sections 11, 12 of wire wound P d in aSingle unit on the s, a fixe 'thereover, each section being independentand of 10 r s t having a plurality of Separate fi dissimilar potential,and a plurality of novel ter- 65 sistances incorporated therein. Bywinding two minal clips 13, best shown in Fig. 7. The clips 13 or moreseparate lengthsv of wire upon a common are self ti b in b t around t amember, and y t e s o W es o d fie sistance, to substantially interfltat the ends, and cross sections. having a pl r i y f p th r n, whenapplied to the wound base, are substantially 15 it is possible toprovide all the resistances necesimmovable thereon, s y in a givencircuit i ne single resistor unit. After the wound base 10 has beenprovided with H w v t q m nt f s m electrical the taps 13, which areseparated from each other circuits necessitate the prov s o in theresistor a distance corresponding to the ohmetric readings f either a pt v or a n a v b a p t al of the resistance desired, rather than actualdisthereacross, which by the use of resistors at presta th t t tappedbase is inserted- 75 em known and u ed n t e a requires iinto a fibrousor non-conducting Jacket 14, which tional labor on the p Of the mechanicengaged is in turn inserted within the metal housing 15, in Chass a s y.thus materially increasing and the marginal edges of the housing arethen the cost of aun so o t folded over to assume the cross sectionalshape It is a Object, of my iIiVentiOn, to P in shown in Fig. 4, thusclosing the unit against 80 a Single n on a e & plurality of Separatelythe admission of any foreign matter. As will be wound, fixedresistances, wound of different sizes t Shown in thi fi r portion of themarginal of W providing dissimilar potentials of predeedges 16 of thejacket 14 are permitted to extend term d values. and having One moreground above the top limits of the metal housing. Thereconnections tothe chassis, readily and simply ef-' after th ground clip 17 '1 appliedt t device 85 fected by utilizing h Protective metal hOlJSing byinserting one end 18 between the portion 16 adapted to facilitate themounting of the device and t terminal clip 13, th grounding" thlg on t eChas s, Which s y is particular terminal clip to the housing. There- BYconstruetihg a Combination resistor h as after solder is dropped at thepoints 19 and 20,

i contemplated, I am ab t Provide either a posithus insuring electricalconnection between the 90 tiv 0 a negative potential a v to ground,terminal clip and metal housing. If, as shown in 0 bo positive andnegative Potentials, in each Fig. 3. the housing is secured to agrounded chassis 0 l O e independently Wound Sections upon 21, thisparticular terminal clip will then be a single base, by the simpleexpedient of ground- "grounded". As Shown diagrammatically in 1 40 thedesired terminal clips dFecuy to the 6, a single terminal clip in eachsection, whether 95 metal housing by a simple and emclent operation atthe end or between the ends thereof may be My invention n he morereadily f g grounded in this fashion, thus providing for each g ggf tothe accompanying drawnllg' independently wound section either a positiveand negative potential on each side of this clip relag z i fiigg fi sgggggg g g 3; gags: tive to the ground, or both a positive and negative 002 c potential between two clips in the same section. ther f; Obviouslythe tapped resistor shown in Figs. 1 ig ii a si e c aig tfo h of thecompleted uniand 2 might suitably applied directly tary resistor of myinvention as applied to a chassis and grounded by s m desirable m 105chassis; h I but it is my conception that the housing shall Fig. '4 is avertical sectional view of theresistor serve the double purpose of notonly a protector taken on the lines 4-4 of Fig. 3; for the unit, andmeans of securing the same to Fig. '5 is an enlarged perspective view ofa the chassis readily as shown, but also to insure around clip such asapplied to the resistor herein; a higher maximum of heat radiatingsurface for no the resistance, thus increasing the efliciency thereofunder abnormal loads.

Obviously my invention contemplates a strip having two or moreindependent resistances formed thereon, and is intended to include alsoeither a noninductive type, or a combination noninductive and inductivetype having independent resistance sections, the terminal clips beingapplied according to ohznetric readings, in the manner disclosed in myco-pending application, Serial No. 519,382, filed March 2, 1931, whichissued as Patent 1,870,462, Aug. 9, 1932.

It is understood that certain modifications and variations are possiblein the above described resistance unit, and I do not wish to be limitedexcept as above stated, and in accordance with the appended claims.

I claim:

1. A resistance unit comprising a flat core of electrical insulatingmaterial, a winding of wire on said core and having high resistance topassage of an electric current, a plurality of terminals about saidwinding and in electrical contact therewith, said terminals comprisingstrips of metal having a SBCllOl'l thereof divided longitudinally, thepar l s of the section so divided being separated and bent about andfastened upon said winding. the undivided section of said terminalsextending away from said winding, said undivided sections of the severalterminals extending in the same plane from said winding, a sheet ofinsulatory material about said winding and about the divided sections ofsaid terminals and having confronting end sections .extending from saidwindings upon each side of and substantially parallel to the extendingsections of said terminals, a casing of sheet metal about said sheet ofinsulating material and having opposed edges confronting but slightlyspaced from each other and pressing upon said sheet of insulatingmaterial and holding said end extensions thereof together and againstthe extending sections of said terminals, and means for grounding aselected number of said terminals, each means for grounding saidterminals comprising a strip of metal having a section inserted inwardlyand between an extending section of one of said ter minals and said endsections of said insulating sheet material and being electricallyconnected to said extending section, and a section adapted to lie uponand electrically connected to said sheet metal casing.

2. A resistance unit comprising a plurality of fiat cores of electricalinsulating material, there being resistance material on or about each ofsaid cores and an open space between certain of said cores, a pluralityof terminals about each of said cores and in electrical contact with theresistance material thereof, a sheet of insulatory material about saidcores and possessing confronting end sections extending from saidresistances upon each side of and substantially parallel to theextending sections of said terminals, and a casing of sheet metal ofhigh conductivity about a portion of said sheet of insulating materialand having opposed edges confronting but slightly spaced from each otherand pressing upon said sheet of insulating material and holding theuncovered end extensions thereof together, a terminal at each side ofthe open space being grounded to said casing and the other terminalsbeing insulated therefrom, whereby a plurality of ground connections areprovided for a plurality of resistances in a single highly conductivecasing without shortcircuiting all of said resistances.

JOHN L. McWEENY.

